op {
  name: "ShardedFilename"
  input_arg {
    name: "basename"
    type: DT_STRING
  }
  input_arg {
    name: "shard"
    type: DT_INT32
  }
  input_arg {
    name: "num_shards"
    type: DT_INT32
  }
  output_arg {
    name: "filename"
    type: DT_STRING
  }
}
